tests/telepathy: Get rid of GSimpleAsyncResult
`GSimpleAsyncResult` has been deprecated in favor of the simple GTask API quite some time ago. Due to the way `TpMutableContactGroupListInterface` is set up, we now also have to implement the `_finish` functions (since we don't use the default GSimpleAsyncResult implementation anymore). Luckily, the functions have the same signature, so we can just reuse one function here.
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